Telegraphic repeater



(No Model.) 7

S. S. EMERY. TELEGRAPHIG REPEATER.

I Patented Mar. 11, 1890.

UNITED STATES PATENT OFFICE.

SIDNEY SHEPPARD EMERY, OF NEWTON CENTRE, MASSACHUSETTS.

TELEGRAPHIC REPEATER.

SPECIFICATION forming part of Letters Patent No. 423,229, dated March11, 1890.

Application filed April 2'7, 1889. Serial No. 308,887. (No model.)

To all whom it may concern:-

Be it known that I, SIDNEY SHEPPARD EM- ERY, a citizen of the UnitedStates, residing 111 Newton Centre, in the county of MiddleseX, State ofMassachusetts, have invented certain new and useful Improvements inTelegraphic Repeaters, of which the following is a specication.

My invention relates to telegraph-repeaters for automaticallyreproducing in a receivingline the signals transmitted upon asendingline, and thereby insuring the proper delivery of the message,however great the distance may be over which the message is transmitted.

In general plan my repeater does not differ fundamentally from othersalready made known; but my invention comprises impor: tant improvements,as described and claimed hereinafter, which both simplify and cheapenthe construction of the various parts of the repeater, and which performtheir respective functions in such amanner as to meet more fully therequirements of a successfully-operative device than has hitherto beenaccomplished.

My invention is illustrated in the accompanying drawing, which is adiagrammatic View showing the circuits and the relays in the positionswhich they occupy when both lines are closed.

1 P are the incoming and outgoing lines, and in the descriptions whichfollow P or the eastern line is considered the sending-line and P or thewestern line is the receivingline, though the action of the repeaterwould of course be the same if this order be reversed.

B B are respectively the receiving and sending relay-magnets, eachplaced in one of the main lines. 1'

E E are the two corresponding relay-armatures, centrally pivoted at 030c and controlling the main lines by insulated spring-contacts O 0,carried at their upper ends, each of which closes the circuit of one ofthe main lines when the armature is attracted by the relay of the otherline. Thus the circuit of the eastern line when complete is throughrelay B to stop A, thence by spring-contact O and wire Y to main batteryR and the ground, and the western line similarly passes to groundthrough relay B, stop A, contact 0, wire Y, and main battery R. If, now,the eastern line be opened, armature E will be drawn back by spring F,thereby breaking the western line at A, and the armature E would inturn, under the infl nen'cebf spring F, break the eastern line at A.This would prevent the closing of the-sending-line at-the station andwould interfere fatally with the operation of the device. To overcomethis "difficulty, local magnets O C are provided, which actv directlyupon the armatures E E, tending, when energized, to turn them in thesame direction as do the relay-magnets.

S is a single local battery for the circuit which proceeds from theopposite poles of said battery. It is divided into two branches, asshown, each including one of. the local magnets. Thus wire T passesthrough magnet O to armature E and the spring-contact 0, carriedthereupon, returning to the battery by wires t and T, and wire T in likemanner passes through magnet O, armature E, springcontact 0, and returnsby t T.

The contacts 0 O on each armature are so arranged that they'engage thefront and back stops alternately and make contact with one of said stopsbefore breaking with the other.

The operation of my invention is therefore as follows: If east be thesending-line and be opened, the magnet B will allow E to fall off,thereby producing a corresponding break in the western line; but beforethe main contact is severed at A the local contact will be establishedat o, and local magnet O is ener gized so as to maintain armature E in aposition to preserve the sending-line closed before the receiving-relayB lets go its hold upon the armature. WVhen, again, the eastern line isclosed at the station, magnetB attracts E, the western line is closed,magnet B attracts E, and then finally the local magnet O loses its holdupon E by the breaking of the circuit at 0. It will therefore be seenthat the local magnet and receiving-relay take turns in holding thearmature E closed against stop A, and that the only parts in therepeater which depend upon any special mechanical nicety are thecontact-springs upon the armatures,which must establish the localcircuit before breaking the main, as above described.

I claim as my invention- The combination, in a telegraphn'epeater, ofthe main lines, the relays, and the local magnets for keeping thesending-line closed, In Witness whereof I have hereunto affixed With thecentrally-pivoted relay-armzttnres E my seal and signed my name in thepresence IO E and the spring-contacts O 0', carried on of twosubscribing Witnesses. the opposite ends, respectively, of the z rlna-SIDNEY SHEPPARD EMERY [L i 5 tures, the contact 0 controlllng the mainreceiving-line and the contact 0 controlling Witnesses: the circuit ofthe local magnet O for keeping E. M. FOWLE; the sending-line closed.ARTHUR E. FOWLE.

